Thank you for the opportunity to help you with your question!

1. There will only be 2 chances, the dollar will become smaller or bigger. Why?
Because in mathematical rules of rounding off numbers:
number below 5 will be round down and 5 and up will be rounded up.
For example:
You have a bill of $6.79 since the
number next to the decimal point in the right is 7, it will be rounded up to
$7.
But if your bill is $6.25, it will be rounded down to $6.00

2. The larger lines with numbers are centimeters, and the smallest lines
are millimeters. Since millimeters are 1/10th of a centimeter,
if you measure 7 marks after a centimeter, it is 1.7 centimeters long.

3. There are two ways of describing, or specifying the members of, a set. One way is by intensional definition, using a rule or semantic description:

A is the set whose members are the first four positive integers.

B is the set of colors of the French Flag

The second way is by extensionâ€“ that is, listing each member of the set. An extensional definition is denoted by enclosing the list of members in curly brackets:

C = {4, 2, 1, 3}

D = {blue, white, red}.

One often has the choice of specifying a set either intensionally or extensionally. In the examples above, for instance, A = C and B = D Please let me know if you need any clarification. I'm always happy to answer your questions.

Sep 10th, 2015

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